40results about How to "Stress relief concentration" patented technology

In the friction agitation joining method according to the present invention, two plate-shaped joining members different in thickness, or a first joining member (1) and a second joining member (2), are butted against each other with a level difference formed at upper surface sides thereof. A rotating probe (42) of the joining tool (40) is inserted into the butted portion (3) of said first and second joining members (1,2) from the upper surface sides thereof. Joining-direction front sides of the first joining member (1) and the second joining member (2) with respect to the probe inserted position is pressed by a first front pressing roller (11) and a second front pressing roller (11), respectively, from the upper surface sides thereof. Furthermore, joining-direction lower sides of the first joining member (1) and the second joining member (2) with respect to a probe inserted position from said upper surface sides is pressed by a first lower pressing roller (21) and a second lower pressing roller (22), respectively, from the upper surface sides thereof. In this state, the butted portion (3) is joined by the friction agitation joining method.

A permanent magnet motor 1 includes a rotor in which permanent magnets 31 are fixed. In the rotor 20, the outer peripheral shape of rotor magnetic-pole portions 24 is formed so that, in the circumferentially central portion, the distance from the center of the rotor iron core 21 is longest, and, at the inter-polar space, the distance from the center of the rotor iron core is shortest, and so that the outermost surface of the rotor magnetic-pole portions 24 forms an arc, and given that sheath thickness tc formed by the outer-side surface of each permanent magnet 31 and the outermost surface of each rotor magnetic-pole portion 24 is practically constant, and letting the thickness of the permanent magnets be the magnet thickness tm, then the relation tc / tm≦0.25 is satisfied.

According to one embodiment, a touch panel includes: a first substrate, a second substrate, and at least one light diffusing particle. The first substrate includes a first principal surface, a second principal surface positioned at a side opposite to the first principal surface, and at least one recess on the second principal surface. The second substrate is arranged to face the first principal surface. At least a portion of the light diffusing particle is positioned corresponding to the recess.

A door mirror set plate is formed of synthetic resin. On a base plate, a support shaft is vertically provided to rotatively support a door mirror body. A curved surface section is embedded at an outside periphery of a base of the support shaft. A flat section is formed to support a thrust washer so as to cross the curved surface section. Inside the support shaft, there is formed a wiring hole provided with a large diameter section, a small diameter section, and a step section. When a conducting wire is inserted into the wiring hole, the tip of a covering touches the step section for positioning. A stopper and a positioning protrusion are integrally formed on a base plate top surface. The stopper restricts rotational angles of the door mirror body. The positioning protrusion holds the door mirror body at a neutral position.

A golf club head is disposed. The golf club head comprises a main body, a neck portion, a hosel, and at least one adjusting groove. The main body has a heel portion and a toe portion. The neck portion is connected to the heel portion of the main body. The hosel is connected to the main body via the neck portion, and the adjusting groove is disposed around the peripheral surface of the neck portion or the hosel.

It is equipped with an injector body 4z which has formed therein high-pressure paths 6az, 6bz, and 6cz through which high-pressure fuel flows to a spray hole and stores therein a piezo-actuator 2z (i.e., an opening / closing mechanism) and a back-pressure control mechanism 3z (i.e., an opening / closing mechanism) which open or close the spray hole, and a fuel pressure sensor 50z installed in the body 4z to measure the pressure of the high-pressure fuel. The body 4z has formed therein a branch path 6ez diverging from the high-pressure paths 6bz and 6cz to deliver the high-pressure fuel to the fuel pressure sensor 50z.

A multilayer capacitor array achieves a high ESR because terminal conductors to which internal electrodes in capacitance sections are connected in parallel are connected in series through internal electrodes in ESR control sections to external electrodes. Since in the multilayer capacitor array the internal electrodes extend as far as a boundary between capacitor element portions, electrostriction occurs in an entire laminate including a region near the boundary between the capacitor element portions, with application of a voltage from the outside. Therefore, concentration of stress due to electrostriction is avoided, so as to suppress occurrence of cracking or the like.

A power transmission system including an integrally molded hub and elastic member, where stress is inhibited from concentrating at the gate marks remaining after integral molding. In a pulley driven by a belt, a plastic pulley side relief section 1a provided at a pocket section of the pulley and a plastic hub side relief section provided on an iron outer ring of the hub engaged at the pocket section whereby power is transmitted from the pulley to the shaft. The hub side relief section and outer ring forming parts of the hub, the iron inner hub to be fastened to the shaft, and the plastic cylindrical part are integrally molded so that the gate mark for plastic injection is formed near to or further to the outer circumference of the outer ring.

A support member (14) for rotatably coupling a first element to a second element. The support member includes a sleeve (50) for rotatably supporting the first element, and a flange (56) having a concave central portion. The flange (56) is coupled to the sleeve (50). The flange (56) has bearing surfaces (68a, 68b) formed thereon along which the flange (56) is mounted to the second element. In one embodiment, the first element is a spindle (12) of a vehicle wheel assembly (11) and is rotatably supported in the sleeve (50) by rollable bearing elements positioned therein. Multiple tapered lobes (64) extend outwardly from the sleeve (50), and the support member (14) is mounted to a vehicle via bearing surfaces (68a, 68b) along the lobes (64). Due to the concave portion of the flange (56), the bearing surfaces (68a, 68b) are the only portions of the flange (56) in contact with the vehicle when the support member (14) is secured to the vehicle, reducing the contact area between the flange (56) and the vehicle, and reducing impact forces transferred to the bearings. A portion of the flange (56) may act as a spring member, enabling the flange (56) to flex in response to an impact load experienced by the wheel bearing assembly (11). This enables the flange (56) to absorb a portion of the side impact load, thereby attenuating the portion of the load transmitted to the bearings. A wheel bearing assembly (10) incorporating the support member (14) is also disclosed.

An extrusion die is provided with a male die through which a billet is extruded from an upstream side to a downstream side and, the male die adapted for forming an inside shape of a hollow material; and a female die for holding the male die and forming an outside shape of the hollow material. The male die is formed of a spider and a holder for holding the spider. The spider is formed of a mandrel and a plurality of bridge parts for supporting the mandrel, and enabling a distal-end outer peripheral surface to engage with a bridge-holding surface. The distal-end outer peripheral surface of each of the bridge parts and the bridge-holding surface of the holder are joined by shrink-fitting.

A fuel supply device includes a flange unit configured to be attached to an upper wall of a fuel tank to close an opening of the fuel tank, a pump unit configured to be disposed within the fuel tank, and a coupling mechanism moveably coupling the pump unit to the flange unit in a vertically slidable manner. The coupling mechanism includes a fixed-side rail member having a rail portion extending vertically from the flange unit, and a movable-side rail member having a channel-groove shaped rail groove extending from the pump unit. The channel-groove shaped rail groove is slidably engaged with the rail portion of the fixed-side rail member. A recess having a semi-circular cross section is formed at a corner of the rail groove of the movable-side rail member.

A method for manufacturing piezoelectric actuator which includes a piezoelectric layer formed of a piezoelectric ceramics material and having a drive area, a first electrode and a second electrode arranged on both surfaces of the piezoelectric material layer respectively each at portion corresponding to the drive area, and a ceramics layer formed of a ceramics material and stacked to face the surface of the piezoelectric material layer on which the first electrode is arranged, the method including: forming a stacked body which includes the piezoelectric material layer, the ceramics layer, and the first electrode, and sintering the stacked body; forming the second electrode on the other surface, of the piezoelectric material layer after the sintering, not facing the ceramics layer; and forming elastic layers having a lower coefficient of elasticity than that of the piezoelectric material layer on both surfaces respectively of the stacked body after the sintering.

A plastic bag includes a plastic bag body with 4-layer gussets on two sides and 2-layer film in the middle. The plastic bag body is provided with a curved hot-seal line near a bottom edge of the bag body. The curved hot seal line turns upward on two sides and is recessed in the middle. Since plastic bags with the structure referred to herein eliminate a stress concentration at a bottom hot-seal location, such plastic bags have increased load-bearing capacity.

There is provided a piezoelectric device including a pressure chamber, a piezoelectric element, and a diaphragm disposed between the pressure chamber and the piezoelectric element. The diaphragm has a crystal plane of an anisotropic single crystal silicon base of which a Poisson's ratio varies according to a direction in the crystal plane. In a vibration region of the diaphragm, which overlaps the pressure chamber in plan view, the Poisson's ratio of the diaphragm in a short axis direction of the smallest rectangle, which includes the vibration region, is included in a range of a minimum value of the Poisson's ratio in the crystal plane inclusive to an average value of the Poisson's ratios in the crystal plane exclusive.

A power transmission system including an integrally molded hub and elastic member, where stress is inhibited from concentrating at the gate marks remaining after integral molding. In a pulley driven by a belt, a plastic pulley side relief section 1a provided at a pocket section of the pulley and a plastic hub side relief section provided on an iron outer ring of the hub engaged at the pocket section whereby power is transmitted from the pulley to the shaft. The hub side relief section and outer ring forming parts of the hub, the iron inner hub to be fastened to the shaft, and the plastic cylindrical part are integrally molded so that the gate mark for plastic injection is formed near to or further to the outer circumference of the outer ring.

There are provided a printed circuit board having a structure for relieving a stress concentration on an outer most lead of leads, due to a difference in thermal expansion coefficients between the semiconductor device and the printed circuit board when the semiconductor device is mounted on the printed circuit board. The printed circuit board includes an inner lead portion to be connected to the semiconductor device. The inner lead portion includes a plurality of leads, arranged in parallel with a same pitch in a predetermined area, and additional leads located near both ends of the predetermined area in which the plurality of leads are arranged in parallel, respectively, wherein each of the plurality of leads has a pitch smaller than 30 μm and a width of the additional lead is wider than 20 μm. There are also provided a semiconductor chip package equipped with the printed circuit board according to the present invention.

An object of the present invention is to provide a master cylinder capable of controlling an increase in an intruding amount of a cup seal while relieving a stress concentration therein to thereby prevent the cup seal from being damaged. Provided is a master cylinder in which a piston is moved in slidable contact with an inner circumference of a cup seal held in a cylinder main body so as to pressurize a brake fluid in a pressure chamber formed of the piston and the cylinder main body, wherein an annular wall configured integrally with the cylinder main body is provided behind the cup seal. Further, a chamfered portion having a curved shape in a cross-section taken along a diameter direction of the cylinder main body is provided between the annular wall and a cylinder wall to which the piston is facing. One end of the chamfered portion is formed continuously so that a tangent thereto is in line with the annular wall, and the other end of the chamfered portion is formed to constitute a flexed portion in combination with the cylinder wall.